Get Real 4A0-115 Exam Dumps [Oct-2023] Practice Tests
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NEW QUESTION # 23
In the exhibit,
MACI moves from PEI to PE2. Which of the following actions related to this MAC address mobility is performed?
- A. PEI generates an update message to remote PES identifying the new location of CEI.
- B. PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
- C. CEI generates an update message to PEI withdrawing its MAC.
- D. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
Answer: D
Explanation:
Explanation
PE2 advertises a MAC/IP route for MAC1 with a sequence number higher than that received from PE1. This indicates that MAC1 has moved from PE1 to PE2 and triggers a MAC withdrawal message from PE1 to remote PEs. CE1 does not generate an update message to PE1 withdrawing its MAC, nor does PE1 generate an update message to remote PEs identifying the new location of CE11.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 24
Based upon the exhibit,
which of the following statements about the forwarding of BUM traffic is FALSE?
- A. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
- B. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
- C. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
- D. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
Answer: D
Explanation:
Explanation
PE3 does not add an ESI label to packets forwarded to PE1 because PE1 is connected to the same Ethernet segment. PE3 adds an ESI label only to packets forwarded to PEs that are not connected to the same Ethernet segment, such as PE21.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 25
Which of the following statements about EVPN auto-discovery per EVPN instance (A-D per EVI) routes is FALSE?
- A. The updates are used to discover all the PES associated with an Ethernet segment.
- B. A PE advertises an A-D per EVI route for each operational service defined on an Ethernet segment.
- C. A PE uses the received updates to create aliasing lists to PES that are part of an all-active Ethernet segment.
- D. The updates include an Ethernet tag ID that is set to zero.
Answer: B
Explanation:
Explanation
A PE does not advertise an A-D per EVI route for each operational service defined on an Ethernet segment. A PE advertises a single A-D per EVI route for all services defined on an Ethernet segment.
NEW QUESTION # 26
Examine the exhibit.
Which of the following statements about the operation of VPLS 20 is TRUE?
- A. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
- B. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- C. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
- D. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
Answer: B
Explanation:
Explanation
PE1 does not advertise a MAC route for MAC-01 when its VPLS 20's SAP becomes operationally UP. PE1 advertises an EVPN MAC/IP route for MAC-01, which includes the IP address of Host 1 and the ESI of the Ethernet segment1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 27
An operator configures an EVPN-IRB that uses the interface-ful unnumbered forwarding model on a Nokia
7750 service router. Which ofthe following statements regarding the configuration performed on each participating PE is FALSE?
- A. An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
- B. The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
- C. A supplementary broadcast domain (SBD) is configured as a routed VPLS.
- D. A VPRN service is configured and has an interface bound to the local VPLS.
Answer: B
Explanation:
Explanation
The advertisement of IP-Prefix routes is not enabled in the SBD VPLS. The advertisement of IP-Prefix routes is enabled in the VPRN service that is associated with the SBD VPLS2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 28
In the exhibit, the EVPN-IRB is configured to use the interface-ful unnumbered model. Which of the following statements regarding the route advertisement is FALSE?
- A. PEI advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE3. The BGP update includes MAC-OI as on overlay index.
- B. PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
- C. PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
- D. PE4 advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. The BGP update includes MAC-04 as an overlay index.
Answer: D
Explanation:
Explanation
PE4 does not advertise an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. PE4 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE2, which includes the MPLS service label of VPRN 152.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 29
The interface-ful numbered model is used for a Layer-3 EVPN service. Which of the following statements is FALSE?
- A. IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
- B. EVPN routes are advertised with a service label associated with the SBD VPLS.
- C. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts.
- D. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
Answer: D
Explanation:
Explanation
EVPN MAC/IP routes are not used to advertise the MAC and IP addresses of SBD IRB interfaces. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts attached to the SBD VPLS2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 30
In the exhibit, VPWS 4 enables communications between CEI and CE2. Which of the following statements regarding the operation of VPWS 4 is FALSE?
- A. PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
- B. PEI and PE3 exchange their service labels using A-D per EVI routes.
- C. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
- D. PE3 and PE4 exchange their service labels over an established targeted LDP session.
Answer: B
Explanation:
Explanation
PE1 and PE3 do not exchange their service labels using A-D per EVI routes. PE1 and PE3 exchange their service labels using MAC routes, which are advertised when their local ACs become operationally UP1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 31
In the exhibit, an EVI range is configured and the preference-based algorithm is used to elect the designated forwarder (DF) on ESI 1. Which PE is elected as DF for VPLS 10?
- A. PEI
- B. PE3
- C. PE4
- D. PE2
Answer: B
Explanation:
Explanation
PE3 is elected as DF for VPLS 10. The preference-based algorithm uses the highest preference value of the PEs attached to the same Ethernet segment as the tie-breaker criterion. PE3 has the highest preference value among PE1, PE2, and PE3.
NEW QUESTION # 32
Examine the exhibit.
Which of the following configuration is NOT required to enable Layer-2 communication between CEI and CE2?
- A. Configure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.
- B. Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
- C. Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
- D. Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
Answer: B
Explanation:
Explanation
The advertisement of IP-Prefix routes is not required to enable Layer-2 communication between CE1 and CE2. IP-Prefix routes are used to enable Layer-3 communication between different subnets in an EVPN-IRB service. For Layer-2 communication, only MAC/IP routes are required2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 33
In the exhibit, PE2 is receiving an EVPN auto-discovery (A-D) route from PEI. Based on the output, which of the following statements is FALSE?
- A. This route indicates that the EVPN service configured on PEI is multi-homed.
- B. This route indicates that the EVPN service is configured on PEI with a service MTU of 1514.
- C. This route is an A-D per EVPN instance (A-D per EVI) route advertised by PEI for a VPWS.
- D. This route indicates that the EVPN service is configured on PEI with an EVPN instance (EVI) of 113.
Answer: B
Explanation:
Explanation
This route indicates that the EVPN service is configured on PE1 with a service MTU of 1500, not 1514. The service MTU is indicated by the MPLS label value in hexadecimal format. The MPLS label value of 0x05DC corresponds to a decimal value of 1500.
NEW QUESTION # 34
Proxy-ARP/ND is operational for a VPLS. Which of the following statements is FALSE?
- A. The PE has proxy-ARP and dynamic-populate enabled for the VPLS.
- B. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
- C. The proxy-ARP table is populated by snooping IP packets received from remote PEs.
- D. When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
Answer: D
Explanation:
Explanation
When the PE learns a local host IP address, it does not add an entry into its proxy-ARP table. The proxy-ARP table is populated by snooping IP packets received from remote PEs. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
NEW QUESTION # 35
Which of the following EVPN routes are exchanged to support the operation of a multi-homed EVPN VPWS?
- A. A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes
- B. Auto-discovery per EVPN instance (A-D per EVI) routes and Auto-discovery per Ethernet segment (A-D per ES) routes only
- C. A-D per EVI routes and ES routes only
- D. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
Answer: A
Explanation:
Explanation
A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes are exchanged to support the operation of a multi-homed EVPN VPWS. These routes are used to discover all PEs associated with an Ethernet segment, indicate the redundancy mode of the Ethernet segment, and elect the designated forwarder for each service.
NEW QUESTION # 36
Based upon the exhibit, which of the following statements is FALSE?
- A. Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
- B. PEI populates this information into the local VPLS FDB.
- C. PEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.
- D. Neighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.
Answer: C
Explanation:
Explanation
PE1 does not use VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3. PE1 uses MPLS tunnels to reach these neighbors, as indicated by the MPLS label values in the output.
NEW QUESTION # 37
Examine the exhibit.
Which of the following actions is performed by PEI after it receives a BUM packet from CEI?
- A. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
- B. PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
- C. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
- D. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
Answer: C
Explanation:
Explanation
PE1 sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2. The ESI label is used to implement the split-horizon mechanism and prevent traffic duplication. The packet sent to PE3 does not need an ESI label because PE3 is connected to the same Ethernet segment as PE1.
NEW QUESTION # 38
Which of the following statements about PE-to-PE MAC address advertisement is FALSE?
- A. A PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.
- B. The service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.
- C. Route targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.
- D. A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
Answer: C
Explanation:
Explanation
Route targets are not used to uniquely identify routes between EVIs in the case of MAC address overlaps.
Route targets are used to control the import and export of routes between different EVIs or VRFs. The service distinguisher (label or VNI) is used to uniquely identify each service1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 39
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